Superheater-boiler.



- Patented July 7, 1914.

. 3 SHEETS-SHEET '1.

WITNESSES J. B. WHITTLESEY,

SUPERHEATER BOILER.

APPLIOATIOH FILED MAR.

Patented July 7, 191%.

3 SHEETSSHEET 2.

WITNESSES m INVENTOR ZL-E. WHITTLESEY.

SUPERHEATER BOILER.

APPLICATION FILED MAR.11, 1912.

' 1,102,836, Patented July 7,1914.

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- j showing one 7 To all whom it may concern: 1 Be itknown that I, JOHN ence being had, to

UNITED snares- ATENT OFFICE.

JOHN E. WHITTLESEY, OF PITTSBURGH, PENNSYLVANIA."

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Specification of Letters Patent. Application filed llarchg'l, m2.- Serial No. seam.

Patented July 7, 1914.

E. WHrr'rLEsnY, a resident of Pittsburgh, in the county of Allegheny .and State of Pennsylvania, haye' invented a new and useful Improvement in Superheater-Bollers, of which the following is a full,clear,and exact description, referthe accompanying drawings, forming part of this specification, in

wh1ch- I Figure 1 is a longitudinal vertlcal section form of boiler embodying my invention. Fig. 2 is a detail sectional view showing the bank of'superheater tubes and a view similar to Fig.2, but showing but showing another modification. Fig. 6

the headers therefor. Fig; 3 is a cross-section on-the line III-III of Fig. 1. Fig. 4 is a modification. Fig. 5 is a view similar to Fig. 1,

a detail view showing an end elevation of a portion of the superheater tubes of Fig. 5.

My invention has relation to superheater boilers; and is designed to provide-a boiler of this type which is free from steam and water drums, and in which the superheating is effected in an upper bank of tubes which are in the last pass of the gases from. the grate tothe stack.

A further object of my inventlon 1s to provide novel baffling means whereby all the before being taken off for use is comsteam,

through all the superheater pelled to pass The nature of my invention will be best understood by reference to the accompanyin drawings, which will now. be described, it eing premised, however, that the invention is susceptible "of various other embodigrate and 1 the I lower bank of longitudinally extending placed above the first bank;

lower bank of ments within the scope of my invention, as defined in the appended claims.

Referring'first to that form of invention as shown in Figs. 1, 2 and 3, the numeral 2 designates the bridge wall. 5 designates-a downwardly and 'rearwardly inclined water tubes; '6 a second bank "of similar water tubes and 7, an upper bank of superheater tubes, the latter being preferably, although not necessarily, of larger diameter than the water tubes. -8 designates a bafliing at the bottom of the tubes 5, this bafliing extending over thev grate and also over the bridge 4, so as to cause the gases andf products of combustion to passto the rear end of the fur-' setting of the boiler, 3 the nace and thence upwardl and forwardly underneath a bafliing 9, which eitends apart of the length of the boilerrfrom the rear. end thereof. 10 is another bafliing which. ex-

tends rearwardly from the front end of boiler. By means of these threefb'afilings', the products of combustion, when they come in contact with the tubes, are first givena forward 'pass, then; a rearward, pass, and then' another forward pass tothe stack 11. The three banksof tubes, all open into th' common headers 12. In order that the steam may be compelled to pass through all-of the rows of superheating tubes 7, I provide the rear header 12 with an internal transverse horizontal baliie 13, which compels the steam to pass forwardly into the front header l2; and I provide the latter with the transverse horizontal baffling 14:, which compels the steam to be charged into this header to make a rearward pass through the superheater,

tubes to the rear-header 12 and thus forwardly to the upper row of tubes into the front header above the baffle 14. 15 designates a steam off-take connected to the upper portion of the front header 12. The intermediate bank of tubes 6 add suflicient water. tube area to the boiler to take the place ofthe water area in the usual steam and waterdrum, while the superheatertubes 7 are preferably equal at least in area to the steam space of the-usual drum. -'I do not, however, limit myself to the use of any particular number of tubes in any of-the bank's, since these may be largely varied. It will be seen that the superheater tubes 7 are almost entirely above the upper bafiie of the boiler, as shown in dotted lines in Fig.1, and that they provide large superheating area which is directly exposed to the "gases-in the lastpass on their way to the stack. By carrying the .superheater' tubes ma e its last pass from the-upper row of superheated t es into the upper portion 12 from. which it is removed by the pipe connection 15.

, In the modification shown in Figs. 5 and 6, instead of extendingfall of the superheater tubes 7 the full length of the furnace, provide an. offset 16 in the roof of ita fiirnace at the front end thereof and in s oifset I place U-shaped superheater pipes 7", which may be arranged as shown in' Fig. 6. These pipes are carried in the front header 12, which is provided with a bafllel3, so as to cause all the. steam to make a lastforward pass through the upper legs of th'e U-shaped pipe 7".

The'advantagcs of my invention will be apparent to those'skilled in th art, since it provides a jcompact and cheap form of superheater boiler, in which the superheatingrated steam from being drawn directly through any tube or tubes into the off-take connection 15. My invention also obviates the use of steam and water drums and provides ample superheating area in the last pass of the gases.

I do not limit myself to the particular embodiments of my invention, which I have herein shown and described, since it is 0bvious that various changes may be made in the arrangement of the water and superheater tubes, and in the construction and arrangement of the'bafiling, without departing from the inventionas set forth in the appended claims.

,I claim: 1 p

I; A drumless superheater boiler having a plurality of banks of water tubes arranged one above another in successive passes of the (gases, a banlr of. super-heating. tubes arrange above the water tubes and in the last pass of the the superheater tubes, and a single off-take ases, together with. two headers in which t -e ends of the supeir- I heater tubes are secured, said headers formfing equalizing chambersforthe steam from connection leading from one of said head.

ers; substantially as described.

2. A drumless su e a plurality of ban s of water tubes arranged one above another in successive longitudinal passes of the gases, a bank of su.-. perheating tubes arranged above the water' tubes inthe last pass of the gases, a box header at each end of the boiler, all of said water tubes opening into and connecting the two headers, the superheating tubes all be-' ing connected to' at least one of said headers, a partition in said last mentioned header, there being an equalizing chamber. formed in said header above said partition, and a' single off-take connection leading from one heater boiler having of said equalizing'chambers; substantially as described.

3. A drumless superheater boiler having a plurality of banks of water tubes arranged one above another in successive lon gitudinal passes of the gases, a bank ensuperheating tubes arranged above the water tubes in the last pass of the gases, a box header at each end of the boiler, all of said water and superheater tubes opening at their ends into the said headers, the headers having baffling between the successive rows i of superheater tubes whereby the steam. is compelled to pass in parallel through the tubes of each horizontal row but in series with successive rows, the last rows of tubes opening into an equalizing chamber in'one of the headers, and a delivery p1 e leading from said equalizing chamber; su stantially as described.

In testimony whereof, I have hereunto set my hand. JOHN E. WHITTLESEY.

Witnesses:

Gno. H. PARMnnnE,

H. M. Conwnv. 

